#region License
/*
 * Copyright (c) 2007, Matthew Holmes
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or
 * other materials provided with the distribution.
 *
 * * Neither the name of The Mango Project nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#endregion

using System;
using System.Collections.Generic;
using System.Text;

namespace Mango.Framework.Common {
    public class Singleton {
        #region Fields

        private static Dictionary<Type, object> m_Singletons = new Dictionary<Type, object> ();

        #endregion

        #region Constructors
        #endregion

        #region Public Methods

        public static bool HasRef<T> () where T : class, IDisposable {
            return m_Singletons.ContainsKey (typeof (T));
        }

        public static void Register<T> (T sngl) where T : class, IDisposable {
            if (!m_Singletons.ContainsKey (typeof (T))) {
                m_Singletons.Add (typeof (T), sngl);
            }
        }

        public static T Ref<T> () where T : class, IDisposable {
            if (m_Singletons.ContainsKey (typeof (T))) {
                return (T)m_Singletons[typeof (T)];
            }

            return null;
        }

        #endregion
    }
}
